0.38*2.4-0.28*0.4用简便方法计算
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0.38×2.4-0.28×0.4
=(0.28+0.1)×2.4-0.28×0.4
=0.28×2.4+0.1×2.4-0.28×0.4
=0.28×2+0.24
=0.56+0.24
=0.8
=(0.28+0.1)×2.4-0.28×0.4
=0.28×2.4+0.1×2.4-0.28×0.4
=0.28×2+0.24
=0.56+0.24
=0.8
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